Students from neighboring schools are showing solidarity with Forest Grove High students who walked out of class Thursday morning after a banner reading "build a wall" was briefly hung in a school hallway.

Students from multiple Washington County high schools, from as far away as Beaverton, Tigard and Tualatin, appear to be joining with Forest Grove, according to interviews with students and social media posts.

Hundreds of Forest Grove High students then walked out of the school Thursday morning and marched down Main Street to the school district office. The hashtag #StandUpFG has taken off on social media.

Peter Wedlake, a sophomore at Glencoe High, said a group of students left the Hillsboro school at 9:45 a.m. and started walking to Forest Grove, about a 9-mile trip. The group has chanted "walls aren't freedom" during their walk, Wedlake said.

They plan to join Forest Grove High students when they arrive, Wedlake said.

"We just kinda want to raise awareness for the number of students that don't support this, the wall," Wedlake said. "We want our voices to be heard."

Paulina Castro, a senior at Hillsboro High, helped organize the walkout and demonstration at the school after hearing of Forest Grove's plans on Wednesday night.

Castro said students made posters and brought flags representing their nationalities. Students left the building and did a walk around the parking lot before setting up in a courtyard.

"This is bigger than us and this is bigger than the 'build the wall sign' that came up," Castro said. "I felt like it was one of those things were it made you angry, and as soon as you heard people were doing something about it, it made you happy. We're so inspired by what they're doing that we decided to join."

Hillsboro High student Edgar Valencia said students prepared for the walkout by staying in touch with their peers at Forest Grove High. Valencia and a group of fellow students talked about what would be said at the walkout and how the demonstration would remain safe.

"We also planned a meeting before the walk out in order to let people know why we were walking out and that it had to be peaceful," Valencia said in an email. "Once we started the walk out the supporters were excited and ready to show their support."

At Tualatin High, at least 150 students protested at about 1:30 p.m., said a district spokeswoman. The students left the school, walked down Southwest Boones Ferry Road and back before returning to class. Some held the flag of Mexico.

At Tigard High, about 200 students gathered in the commons and chanted and held banners, according to a receptionist. The students walked around the school and were back to class by about 1:50 p.m.

Students from Liberty High in Hillsboro and Beaverton High have also joined in, according to posts on social media. Some students from Liberty have gathered with students in Forest Grove.